This High School Apologetics site has a lot of interesting stuff!
1 Everything which begins to exist must have a cause for its existence.
1.2 The universe began to exist
1.3 Therefore the universe had a cause for its existence
2 The universe is primarily the expansion of time, space and matter
2.1 Therefore time, space and matter were caused.
3 An effect may be no greater than its proper cause
3.1 A thing may not cause itself to exist
3.2 Therefore the cause of the universe is eternal and immaterial.
4 Only a free-agent is able to produce real change (greater change) either through time, space and matter, in its creation, or in its annihilation. All other changes are merely natural and deterministic processes (lesser change)
4.1 In the absence of the universe (time, space and matter) there could be no change of the lesser sort
4.2 Therefore the immaterial, and eternal cause of the universe was not an inanimate thing, but a free-agent, a mind.
5 The difference between nonbeing “in reality” and being “in reality”, is an infinite difference
5.1 The difference between nonbeing “in the mind” and being “in the mind” is an infinite difference
5.2 The free-agent in question created something from nothing, and it follows that it conceived something from nothing
5.3 To create something from nothing is an infinite power, and to conceive something from nothing is an infinite act of conception or knowledge.
5.4 Therefore the cause of the universe is an eternal, transcendent, omniscient, omnipotent mind, which can properly be called God.